This problem allows students to investigate ratio and proportion, by discovering the exchange rate between different alien currencies (i.e. 7 circles have the same value as 3 triangles, etc.) By manip...More: lessons, discussions, ratings, reviews,...

Students answer the question: Is the ratio of our arm span to our height really equal to 1? If an emphasis is given to a/h = 1, this can be an engaging activity using variables. Use a spreadsheet to w...More: lessons, discussions, ratings, reviews,...

Question: Is the ratio of our arm span to our height really equal to 1? If an emphasis is given to a/h = 1, this can be an engaging activity using variables. Use a spreadsheet to work with the data.More: lessons, discussions, ratings, reviews,...

An activity designed to take advantage of the features of the TI-15 calculator. Using a toy lion and a lever, students will discover how much work is needed to raise the toy lion. They will use propor...More: lessons, discussions, ratings, reviews,...

This is the junior version of Geom-e-Tree. It enables the manipulation of geometric trees with two or three branches. Change angle between branches and change common ratio. Selectable themes draw ...More: lessons, discussions, ratings, reviews,...

Depending on the student's approach to this problem, many types of math can be incorporated to solve this problem. The concept of ratio is used throughout, and students can solve the problem by experi...More: lessons, discussions, ratings, reviews,...

This material is based upon work supported by the
National Science Foundation under Grant DUE-0226284.
Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s)
and do not necessarily reflect the views of the
National Science Foundation.